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Nature of Operations and Significant Accounting Policies - Re-cohorting Impacts To Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Increase to income before taxes |  |  |
Cost of reinsurance amortization | $ (631.6) | $ (17.7) | $ (19.3)
Income (loss) before income taxes | $ 1,889.6 | $ 738.8 | 5,987.0
Adjustment related to actuarial balance re-cohorting |  |  |
Increase to income before taxes |  |  |
Cost of reinsurance amortization |  |  | 33.7
Change in additional liability for certain benefit features |  |  | 167.4
Income (loss) before income taxes |  |  | 201.1
Increase to pre-tax other comprehensive income |  |  |
Cost of reinsurance unrealized gains (losses) |  |  | (2.1)
Change in additional liability for certain benefit features unrealized gains |  |  | 7.8
Total increase to pre-tax other comprehensive income |  |  | 5.7
Total increase to pre-tax comprehensive income |  |  | $ 206.8

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